From 7a6f45f05ac39b8d0c75f55c0be157bbd226cff9 Mon Sep 17 00:00:00 2001
From: Bedis Nbiba <bedisnbiba@gmail.com>
Date: Tue, 9 Apr 2024 10:07:08 +0100
Subject: [PATCH] chore: add helpful message when --unstable-ffi is not passed
 (#37)

---
 mod.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mod.ts b/mod.ts
index 2a5219a..9386d7b 100644
--- a/mod.ts
+++ b/mod.ts
@@ -151,6 +151,9 @@ export async function dlopen<S extends Deno.ForeignLibraryInterface>(
   options: FetchOptions,
   symbols: Const<S>,
 ): Promise<Deno.DynamicLibrary<S>> {
+  if (Deno.dlopen === undefined) {
+    throw new Error("`--unstable-ffi` is required");
+  }
   // deno-lint-ignore no-explicit-any
   return Deno.dlopen<S>(await download(options), symbols as any);
 }